Test: Ratio & Proportion - 2 - JAMB MCQ

Let the length be 5x and the width be 2x.
Area = length × width, so 560
= 5x × 2x.
Solving for x, we get x = 8.
The length is 5x = 5(8) = 40 units.

Let the number of boys be 3x and the number of girls be 4x.
Then, 3x + 4x = 28.
Solving for x, we get x = 4.
The number of girls is 4x = 4(4) = 16.

Let the smaller number be 3x and the larger number be 4x.
Then, 3x + 4x = 35.
Solving for x, we get x = 5.
The smaller number is 3x = 3(5)
= 15.

Since the ratio of the angles is 1:2:3, the angles are x, 2x, and 3x.
The sum of the angles in a triangle is 180 degrees,
so x + 2x + 3x = 180.
Solving for x, we get x = 30.
The smallest angle is x = 30 degrees.

Let the number of pages Jane read be 3x and the number of pages she has left to read be 5x.
Then, 5x = 40.
Solving for x, we get x = 8.
The number of pages Jane read is 3x = 3(8) = 24.

Let the number of erasers be 3x.
Then, 5x = 20. Solving for x,
we get x = 4.
The number of erasers is 3x = 3(4)
= 12.

Let the amount of money at the beginning of the month be 4x and the amount at the end of the month be 5x. Then, 5x = ₦450.
Solving for x, we get x = ₦90.
The amount at the beginning of the month is 4x = 4(₦90)
= ₦360.

Let the number of hours spent studying be 3x.
Then, 7x = 42.
Solving for x, we get x = 6.
The number of hours spent studying is 3x = 3(6)
= 18.

Let the number of oranges be 3x.
Then, 2x = 10.
Solving for x, we get x = 5.
The number of oranges is 3x = 3(5)
= 15.

Let the father's age be 5x and the son's age be x.
Then, 5x + x = 72.
Solving for x, we get x = 12.
The son's age is x = 12 years.